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Sat, 10 Jul 2021 22:57:53 +0000 From: "Zhang, Qiang" To: Matthew Wilcox , Andrew Morton CC: "mgorman@techsingularity.net" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages_bulk() Thread-Topic: [PATCH] mm/page_alloc: avoid hard lockups in __alloc_pages_bulk() Thread-Index: AQHXdX7omT+QlOLigUCyCri849UNXKs8jLiAgAAoMICAAB1Rcg== Date: Sat, 10 Jul 2021 22:57:53 +0000 Message-ID: References: <20210710112929.232268-1-qiang.zhang@windriver.com> <20210710114613.0db3ac139a7b3102a6ca3ad4@linux-foundation.org>, In-Reply-To: Accept-Language: en-001, zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 64b1fdaa-076b-4928-1008-08d943f6267b x-ms-traffictypediagnostic: BL1PR11MB5255: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL1PR11MB5478.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(376002)(346002)(136003)(396003)(366004)(39830400003)(8676002)(4326008)(86362001)(7696005)(6506007)(91956017)(76116006)(478600001)(5660300002)(54906003)(186003)(52536014)(71200400001)(110136005)(316002)(8936002)(66476007)(66446008)(38100700002)(66556008)(64756008)(122000001)(9686003)(66946007)(55016002)(83380400001)(33656002)(2906002);DIR:OUT;SFP:1101; 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charset="gb2312" Content-Transfer-Encoding: quoted-printable
=B7=A2=BC=FE=C8=CB: Matthew Wilcox <willy@infradead.org>
=B7=A2=CB=CD=CA=B1=BC=E4: =D0=C7=C6=DA=C8=D5, =C6=DF=D4=C2 11, 2021 = 05:10
=CA=D5=BC=FE=C8=CB: Andrew Morton
=B3=AD=CB=CD: Zhang, Qiang; mgorman@techsingularity.net; linux-mm@kv= ack.org; linux-kernel@vger.kernel.org
=D6=F7=CC=E2: Re: [PATCH] mm/page_alloc: avoid hard lockups in __all= oc_pages_bulk()
 
[Please note: This e-mail is from an EXTERNAL e-ma= il address]

On Sat, Jul 10, 2021 at 11:46:13AM -0700, Andrew Morton wrote:
> On Sat, 10 Jul 2021 19:29:29 +0800 qiang.zhang@windriver.com wrote: >
> > From: Zqiang <qiang.zhang@windriver.com>
> >
> > The __alloc_pages_bulk() mainly used for batch allocation of
> > order-0 pages, in the case of holding pagesets.lock, if too
> > many pages are required, maybe trigger hard lockup watchdog.
>
> Ouch.  Has this been observed in testing?  If so, can you pl= ease share
> the kernel debug output from that event?

>This should be fixed in the caller by asking for fewer pages.
>The NFS and vmalloc cases have already been fixed for this.

The NFS and vmalloc cases haven  = been fixed=A3=BF
I don=A1=AFt see if there is any infor= mation about that?

Thanks
Qiang
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